142872857 has 4 divisors (see below), whose sum is σ = 144478260. Its totient is φ = 141267456.

The previous prime is 142872853. The next prime is 142872859. The reversal of 142872857 is 758278241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37687321 + 105185536 = 6139^2 + 10256^2 .

It is a cyclic number.

It is not a de Polignac number, because 142872857 - 2² = 142872853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142872853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 802568 + ... + 802745.

It is an arithmetic number, because the mean of its divisors is an integer number (36119565).

Almost surely, 2^142872857 is an apocalyptic number.

It is an amenable number.

142872857 is a deficient number, since it is larger than the sum of its proper divisors (1605403).

142872857 is an equidigital number, since it uses as much as digits as its factorization.

142872857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605402.

The product of its digits is 250880, while the sum is 44.

The square root of 142872857 is about 11952.9434450264. The cubic root of 142872857 is about 522.7771254895. Note that the first 3 decimals are identical.

The spelling of 142872857 in words is "one hundred forty-two million, eight hundred seventy-two thousand, eight hundred fifty-seven".